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Hello All! I wonder if someone here has the knowledge to solve a very annoying problem I have been facing lately: I create Porcelain plates, about 9" in diameter. The wight of each plate after glaze firing is about 200 to 250 grams which makes them pretty thin. When bisque firing them, all is well - Always. When glaze firing them (1230 C) , many many of the plates are broken WHEN TOUCHED, that means that when I open the kiln, they all look fine but when I come to pick them up, they break up in my hands. Those that do make it in one piece, have a hollow sound when knocked an